As new details emerge of a new witness, it is being reported that the grand jury, Federal prosecutors and the FBI will investigate the incident that resulted in the murder of Trayvon Martin.

Martin was killed by a neighborhood watch caption, George Zimmerman, while walking home from the store. The unarmed teen was carrying candy he purchased from the store.

From CNN:

A girl who overheard part of an incident involving Florida teenager Trayvon Martin can help prove he was killed “in cold blood,” an attorney for Martin’s family said Tuesday.

The girl, who was dating the 17-year-old, “completely blows (George) Zimmerman’s absurd self-defense claim out of the water,” Benjamin Crump said at a news conference.

He said the girl — who does not wish to be identified — “connects the dots” to describe what happened that day.

The girl heard someone ask Martin what he was doing, and heard Martin ask why the person was following him, Crump said. The girl then got the impression that there was an altercation in which the earpiece fell out of Martin’s ear and the phone went out, Crump said.

The girl believed that someone had pushed Martin based on what she she heard and the fact that his voice changed.

The girl provided a recording to Crump which he will share with authorities, he said.